STM32L431RBT6

{
  "schema_version": 1,
  "type": "component",
  "slug": "stm32l431rbt6",
  "title": "STM32L431RBT6",
  "brief": "STMicroelectronics Microcontrollers (MCU/MPU/SOC), LQFP-64(10x10). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "embedded processors & controllers",
    "stm32l431rbt6",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "STM32L431RBT6",
    "manufacturer": "STMicroelectronics",
    "package": "LQFP-64(10x10)",
    "pin_count": 64,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588858459123298304",
    "parts": {
      "symbol": "stm32l431rbt6.kicad_sym",
      "footprint": "stm32l431rbt6.kicad_mod",
      "model_3d": "stm32l431rbt6-hero.glb",
      "model_3d_plain": "stm32l431rbt6.glb",
      "model_3d_step": "stm32l431rbt6-etched.step",
      "model_3d_step_plain": "stm32l431rbt6.step",
      "lbr": "stm32l431rbt6.lbr"
    },
    "distributor_links": {
      "lcsc": "C118213",
      "digikey": "497-16837-ND",
      "mouser": "511-STM32L431RBT6"
    },
    "distributor_check": {
      "checked_at": "2026-10-10T23:41:35Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "497-16837-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "511-STM32L431RBT6",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VBAT",
        "type": "power_in",
        "description": "Backup domain supply for the RTC and 32x32-bit backup registers, with a backup operating voltage of 1.55 V to 3.6 V."
      },
      {
        "number": "2",
        "name": "PC13",
        "type": "bidirectional",
        "description": "FT I/O supplied through the power switch, so output speed must not exceed 2 MHz with a 30 pF maximum load and it must not be used as a current source (note 1); also RTC_TAMP1, RTC_TS, RTC_OUT, WKUP2, EVENTOUT."
      },
      {
        "number": "3",
        "name": "PC14-OSC32_IN (PC14)",
        "type": "bidirectional",
        "description": "FT I/O with the same power-switch limits as PC13 (2 MHz, 30 pF, no current-source use); alternate function OSC32_IN (low-speed oscillator input)."
      },
      {
        "number": "4",
        "name": "PC15-OSC32_OUT (PC15)",
        "type": "bidirectional",
        "description": "FT I/O with the same power-switch limits as PC13 (2 MHz, 30 pF, no current-source use); alternate function OSC32_OUT (low-speed oscillator output)."
      },
      {
        "number": "5",
        "name": "PH0-OSC_IN (PH0)",
        "type": "bidirectional",
        "description": "FT I/O; additional function OSC_IN (oscillator input), with EVENTOUT as alternate function."
      },
      {
        "number": "6",
        "name": "PH1-OSC_OUT (PH1)",
        "type": "bidirectional",
        "description": "FT I/O; additional function OSC_OUT (oscillator output), with EVENTOUT as alternate function."
      },
      {
        "number": "7",
        "name": "NRST",
        "type": "bidirectional",
        "description": "Bidirectional reset pin with an embedded weak pull-up resistor (RST structure)."
      },
      {
        "number": "8",
        "name": "PC0",
        "type": "bidirectional",
        "description": "FT_fa I/O (5 V tolerant, Fm+ capable, analog switch supplied by VDDA) with ADC1_IN1; alternates LPTIM1_IN1, I2C3_SCL, LPUART1_RX, LPTIM2_IN1, EVENTOUT."
      },
      {
        "number": "9",
        "name": "PC1",
        "type": "bidirectional",
        "description": "FT_fa I/O (5 V tolerant, Fm+ capable, analog switch supplied by VDDA) with ADC1_IN2; alternates LPTIM1_OUT, I2C3_SDA, LPUART1_TX, EVENTOUT."
      },
      {
        "number": "10",
        "name": "PC2",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with ADC1_IN3; alternates LPTIM1_IN2, SPI2_MISO, EVENTOUT."
      },
      {
        "number": "11",
        "name": "PC3",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with ADC1_IN4; alternates LPTIM1_ETR, SPI2_MOSI, SAI1_SD_A, LPTIM2_ETR, EVENTOUT."
      },
      {
        "number": "12",
        "name": "VSSA/VREF-",
        "type": "power_in",
        "description": "Analog ground and negative ADC reference voltage; VREF- can be internally connected to VSSA depending on the package."
      },
      {
        "number": "13",
        "name": "VDDA/VREF+",
        "type": "power_in",
        "description": "Analog supply (1.62 V to 3.6 V when ADC or COMP is used) and positive ADC reference VREF+, which can be internally connected to VDDA depending on the package."
      },
      {
        "number": "14",
        "name": "PA0",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with ADC1_IN5, OPAMP1_VINP, COMP1_INM, RTC_TAMP2, WKUP1; alternates TIM2_CH1, USART2_CTS, COMP1_OUT, SAI1_EXTCLK, TIM2_ETR, EVENTOUT."
      },
      {
        "number": "15",
        "name": "PA1",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with ADC1_IN6, OPAMP1_VINM, COMP1_INP; alternates TIM2_CH2, I2C1_SMBA, SPI1_SCK, USART2_RTS_DE, TIM15_CH1N, EVENTOUT."
      },
      {
        "number": "16",
        "name": "PA2",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with ADC1_IN7, COMP2_INM, WKUP4, LSCO; alternates TIM2_CH3, USART2_TX, LPUART1_TX, QUADSPI_BK1_NCS, COMP2_OUT, TIM15_CH1, EVENTOUT."
      },
      {
        "number": "17",
        "name": "PA3",
        "type": "bidirectional",
        "description": "TT_a I/O (3.6 V tolerant, analog switch supplied by VDDA) with OPAMP1_VOUT, COMP2_INP, ADC1_IN8; alternates TIM2_CH4, USART2_RX, LPUART1_RX, QUADSPI_CLK, SAI1_MCLK_A, TIM15_CH2, EVENTOUT."
      },
      {
        "number": "18",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference."
      },
      {
        "number": "19",
        "name": "VDD",
        "type": "power_in",
        "description": "Standard operating supply voltage, 1.71 V to 3.6 V."
      },
      {
        "number": "20",
        "name": "PA4",
        "type": "bidirectional",
        "description": "TT_a I/O (3.6 V tolerant, analog switch supplied by VDDA) with COMP1_INM, COMP2_INM, ADC1_IN9, DAC1_OUT1; alternates SPI1_NSS, SPI3_NSS, USART2_CK, SAI1_FS_B, LPTIM2_OUT, EVENTOUT."
      },
      {
        "number": "21",
        "name": "PA5",
        "type": "bidirectional",
        "description": "TT_a I/O (3.6 V tolerant, analog switch supplied by VDDA) with COMP1_INM, COMP2_INM, ADC1_IN10, DAC1_OUT2; alternates TIM2_CH1, TIM2_ETR, SPI1_SCK, LPTIM2_ETR, EVENTOUT."
      },
      {
        "number": "22",
        "name": "PA6",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with ADC1_IN11; alternates TIM1_BKIN, SPI1_MISO, COMP1_OUT, USART3_CTS, LPUART1_CTS, QUADSPI_BK1_IO3, TIM1_BKIN_COMP2, TIM16_CH1, EVENTOUT."
      },
      {
        "number": "23",
        "name": "PA7",
        "type": "bidirectional",
        "description": "FT_fa I/O (5 V tolerant, Fm+ capable, analog switch supplied by VDDA) with ADC1_IN12; alternates TIM1_CH1N, I2C3_SCL, SPI1_MOSI, QUADSPI_BK1_IO2, COMP2_OUT, EVENTOUT."
      },
      {
        "number": "24",
        "name": "PC4",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with COMP1_INM, ADC1_IN13; alternates USART3_TX, EVENTOUT."
      },
      {
        "number": "25",
        "name": "PC5",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with COMP1_INP, ADC1_IN14, WKUP5; alternates USART3_RX, EVENTOUT."
      },
      {
        "number": "26",
        "name": "PB0",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with ADC1_IN15; alternates TIM1_CH2N, SPI1_NSS, USART3_CK, QUADSPI_BK1_IO1, COMP1_OUT, SAI1_EXTCLK, EVENTOUT."
      },
      {
        "number": "27",
        "name": "PB1",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with COMP1_INM, ADC1_IN16; alternates TIM1_CH3N, USART3_RTS_DE, LPUART1_RTS_DE, QUADSPI_BK1_IO0, LPTIM2_IN1, EVENTOUT."
      },
      {
        "number": "28",
        "name": "PB2",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) with COMP1_INP; alternates RTC_OUT, LPTIM1_OUT, I2C3_SMBA, EVENTOUT."
      },
      {
        "number": "29",
        "name": "PB10",
        "type": "bidirectional",
        "description": "FT_f I/O (5 V tolerant, Fm+ capable); alternates TIM2_CH3, I2C2_SCL, SPI2_SCK, USART3_TX, LPUART1_RX, TSC_SYNC, QUADSPI_CLK, COMP1_OUT, SAI1_SCK_A, EVENTOUT."
      },
      {
        "number": "30",
        "name": "PB11",
        "type": "bidirectional",
        "description": "FT_f I/O (5 V tolerant, Fm+ capable); alternates TIM2_CH4, I2C2_SDA, USART3_RX, LPUART1_TX, QUADSPI_BK1_NCS, COMP2_OUT, EVENTOUT."
      },
      {
        "number": "31",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference."
      },
      {
        "number": "32",
        "name": "VDD",
        "type": "power_in",
        "description": "Standard operating supply voltage, 1.71 V to 3.6 V."
      },
      {
        "number": "33",
        "name": "PB12",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates TIM1_BKIN, TIM1_BKIN_COMP2, I2C2_SMBA, SPI2_NSS, USART3_CK, LPUART1_RTS_DE, TSC_G1_IO1, SWPMI1_IO, SAI1_FS_A, TIM15_BKIN, EVENTOUT."
      },
      {
        "number": "34",
        "name": "PB13",
        "type": "bidirectional",
        "description": "FT_f I/O (5 V tolerant, Fm+ capable); alternates TIM1_CH1N, I2C2_SCL, SPI2_SCK, USART3_CTS, LPUART1_CTS, TSC_G1_IO2, SWPMI1_TX, SAI1_SCK_A, TIM15_CH1N, EVENTOUT."
      },
      {
        "number": "35",
        "name": "PB14",
        "type": "bidirectional",
        "description": "FT_f I/O (5 V tolerant, Fm+ capable); alternates TIM1_CH2N, I2C2_SDA, SPI2_MISO, USART3_RTS_DE, TSC_G1_IO3, SWPMI1_RX, SAI1_MCLK_A, TIM15_CH1, EVENTOUT."
      },
      {
        "number": "36",
        "name": "PB15",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates RTC_REFIN, TIM1_CH3N, SPI2_MOSI, TSC_G1_IO4, SWPMI1_SUSPEND, SAI1_SD_A, TIM15_CH2, EVENTOUT."
      },
      {
        "number": "37",
        "name": "PC6",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates TSC_G4_IO1, SDMMC1_D6, EVENTOUT."
      },
      {
        "number": "38",
        "name": "PC7",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates TSC_G4_IO2, SDMMC1_D7, EVENTOUT."
      },
      {
        "number": "39",
        "name": "PC8",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates TSC_G4_IO3, SDMMC1_D0, EVENTOUT."
      },
      {
        "number": "40",
        "name": "PC9",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates TSC_G4_IO4, SDMMC1_D1, EVENTOUT."
      },
      {
        "number": "41",
        "name": "PA8",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates MCO, TIM1_CH1, USART1_CK, SWPMI1_IO, SAI1_SCK_A, LPTIM2_OUT, EVENTOUT."
      },
      {
        "number": "42",
        "name": "PA9",
        "type": "bidirectional",
        "description": "FT_f I/O (5 V tolerant, Fm+ capable); alternates TIM1_CH2, I2C1_SCL, USART1_TX, SAI1_FS_A, TIM15_BKIN, EVENTOUT."
      },
      {
        "number": "43",
        "name": "PA10",
        "type": "bidirectional",
        "description": "FT_f I/O (5 V tolerant, Fm+ capable); alternates TIM1_CH3, I2C1_SDA, USART1_RX, SAI1_SD_A, EVENTOUT."
      },
      {
        "number": "44",
        "name": "PA11",
        "type": "bidirectional",
        "description": "FT_u I/O; alternates TIM1_CH4, TIM1_BKIN2, SPI1_MISO, COMP1_OUT, USART1_CTS, CAN1_RX, TIM1_BKIN2_COMP1, EVENTOUT."
      },
      {
        "number": "45",
        "name": "PA12",
        "type": "bidirectional",
        "description": "FT_u I/O; alternates TIM1_ETR, SPI1_MOSI, USART1_RTS_DE, CAN1_TX, EVENTOUT."
      },
      {
        "number": "46",
        "name": "PA13 (JTMS-SWDIO)",
        "type": "bidirectional",
        "description": "FT I/O that is configured as the JTMS-SWDIO debug function after reset with its internal pull-up activated (note 3); also IR_OUT, SWPMI1_TX, SAI1_SD_B, EVENTOUT."
      },
      {
        "number": "47",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference."
      },
      {
        "number": "48",
        "name": "VDD",
        "type": "power_in",
        "description": "Standard operating supply voltage, 1.71 V to 3.6 V."
      },
      {
        "number": "49",
        "name": "PA14 (JTCK-SWCLK)",
        "type": "bidirectional",
        "description": "FT I/O that is configured as the JTCK-SWCLK debug function after reset with its internal pull-down activated (note 3); also LPTIM1_OUT, I2C1_SMBA, SWPMI1_RX, SAI1_FS_B, EVENTOUT."
      },
      {
        "number": "50",
        "name": "PA15 (JTDI)",
        "type": "bidirectional",
        "description": "FT I/O that is configured as the JTDI debug function after reset with its internal pull-up activated (note 3); also TIM2_CH1, TIM2_ETR, USART2_RX, SPI1_NSS, SPI3_NSS, USART3_RTS_DE, TSC_G3_IO1, SWPMI1_SUSPEND, EVENTOUT."
      },
      {
        "number": "51",
        "name": "PC10",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates SPI3_SCK, USART3_TX, TSC_G3_IO2, SDMMC1_D2, EVENTOUT."
      },
      {
        "number": "52",
        "name": "PC11",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates SPI3_MISO, USART3_RX, TSC_G3_IO3, SDMMC1_D3, EVENTOUT."
      },
      {
        "number": "53",
        "name": "PC12",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates SPI3_MOSI, USART3_CK, TSC_G3_IO4, SDMMC1_CK, EVENTOUT."
      },
      {
        "number": "54",
        "name": "PD2",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates USART3_RTS_DE, TSC_SYNC, SDMMC1_CMD, EVENTOUT."
      },
      {
        "number": "55",
        "name": "PB3 (JTDO-TRACESWO)",
        "type": "bidirectional",
        "description": "FT_a I/O (5 V tolerant, analog switch supplied by VDDA) configured as the JTDO-TRACESWO debug function after reset (note 3); also COMP2_INM, TIM2_CH2, SPI1_SCK, SPI3_SCK, USART1_RTS_DE, SAI1_SCK_B, EVENTOUT."
      },
      {
        "number": "56",
        "name": "PB4 (NJTRST)",
        "type": "bidirectional",
        "description": "FT_fa I/O (5 V tolerant, Fm+ capable, analog switch supplied by VDDA) configured as NJTRST with its internal pull-up activated after reset (note 3); also COMP2_INP, I2C3_SDA, SPI1_MISO, SPI3_MISO, USART1_CTS, TSC_G2_IO1, SAI1_MCLK_B, EVENTOUT."
      },
      {
        "number": "57",
        "name": "PB5",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant); alternates LPTIM1_IN1, I2C1_SMBA, SPI1_MOSI, SPI3_MOSI, USART1_CK, TSC_G2_IO2, COMP2_OUT, SAI1_SD_B, TIM16_BKIN, EVENTOUT."
      },
      {
        "number": "58",
        "name": "PB6",
        "type": "bidirectional",
        "description": "FT_fa I/O (5 V tolerant, Fm+ capable, analog switch supplied by VDDA) with COMP2_INP; alternates LPTIM1_ETR, I2C1_SCL, USART1_TX, TSC_G2_IO3, SAI1_FS_B, TIM16_CH1N, EVENTOUT."
      },
      {
        "number": "59",
        "name": "PB7",
        "type": "bidirectional",
        "description": "FT_fa I/O (5 V tolerant, Fm+ capable, analog switch supplied by VDDA) with COMP2_INM and PVD_IN; alternates LPTIM1_IN2, I2C1_SDA, USART1_RX, TSC_G2_IO4, EVENTOUT."
      },
      {
        "number": "60",
        "name": "PH3/BOOT0",
        "type": "bidirectional",
        "description": "FT I/O (5 V tolerant) whose additional function is BOOT0, the boot mode selection pin; also EVENTOUT."
      },
      {
        "number": "61",
        "name": "PB8",
        "type": "bidirectional",
        "description": "FT_f I/O (5 V tolerant, Fm+ capable); alternates I2C1_SCL, CAN1_RX, SDMMC1_D4, SAI1_MCLK_A, TIM16_CH1, EVENTOUT."
      },
      {
        "number": "62",
        "name": "PB9",
        "type": "bidirectional",
        "description": "FT_f I/O (5 V tolerant, Fm+ capable); alternates IR_OUT, I2C1_SDA, SPI2_NSS, CAN1_TX, SDMMC1_D5, SAI1_FS_A, EVENTOUT."
      },
      {
        "number": "63",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference."
      },
      {
        "number": "64",
        "name": "VDD",
        "type": "power_in",
        "description": "Standard operating supply voltage, 1.71 V to 3.6 V."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin mapping was taken from the LQFP64 column of Table 14 (pin definitions, pages 54-63). The Figure ; Package variant check: STM32L431RBT6 decodes as R = 64 pins, B = 128 KB flash, T = LQFP, 6 = tempera; Pins PC13, PC14 and PC15 are supplied through the power switch, which sinks/sources only about 3 mA."
        ],
        "pages_sent": 81,
        "cost_usd": 0.3671,
        "at": "2026-10-10T23:41:09"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588858459123298304",
        "pages": 200,
        "sha256": "fc652d7acd05c2a9",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 64,
        "described": 64,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "stm32l431rbt6.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          12,
          12,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "b0c827bc5c05552175d28affe44a5bd2ab45c9c36efff6ff07a74cc449b13db4",
        "checked": "2026-10-10",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "stm32l431rbt6-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          12,
          12,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "a8c2b5051c56e349532a57fd1d8f24bfecf55a501b432462f61ddc337093dfcf",
        "checked": "2026-10-10",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "LQFP-64(10x10)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "64"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "stm32l431rbt6"
  ],
  "discovery_pitch": "STM32L431RBT6 (STMicroelectronics) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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